We've found 4 phrases for unstable (0.24 seconds):

arse over tit »    Tumbling; falling; upside-down; unstable or unbalanced.

bleeding edge »    Something very current, or modern where there may actually be a hazard or risk in using it, such as with potentially unstable software. The term relates to a sword.

break down »    To become unstable, mentally or otherwise.

touch off »    To start; to cause, especially used for unstable situations that may magnify if disturbed.

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